The C-6 LOP adapter is the threaded end of the buttstock that threads into the chassis. Between the short and long adapters, you can acquire three different ranges depending on if the buttstock is set up in the fixed or folding configuration.
- Short-Fixed: 12-13 inches
- Short-Folding: 13.5-14.5 inches
- Long-Fixed: 13.5-14.5 inches
- Long-Folding: 15-16 inches